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Summary
=======
By entering an overly long password, it may be possible to execute arbitrary code on a vulnerable device. This vulnerability affects all devices and hardware modules that are running ACNS software releases prior to 4.2.11 and 5.0.5. The workaround is to disable the CE GUI server.

Details
=======
By supplying an overly long password, it is possible to trigger a buffer overflow in the authentication module. This may enable an attacker to execute arbitrary code on the affected device.

This vulnerability is assigned Cisco bug IDs CSCeb25596 and CSCeb27087.

Impact
======
The impact of the exploitation of this vulnerability can range from a Denial-of-Service to complete control of the device.

Software Versions and Fixes
===========================
This vulnerability is fixed in 4.2.11 and 5.0.5 releases of ACNS.

Obtaining Fixed Software
========================
Cisco is offering free software upgrades to remedy this vulnerability for all affected customers. Customers may only install and expect support for the feature sets they have purchased.

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for assistance with the upgrade, which should be free of charge.

Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). In those cases, customers may only upgrade to a later version of the same release as indicated by the applicable row in the Software Versions and Fixes table. TAC contacts are as follows:

Please have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades

Workarounds
===========
The workaround is to disable the CE GUI server using the following
command:

no gui-server enable

Exploitation and Public Announcements =====================================
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. This vulnerability was discovered during internal testing.

Status of This Notice: FINAL
============================
This is a final advisory. Although Cisco cannot guarantee the accuracy of all statements in this advisory, all of the facts have been checked to the best of our ability. Cisco does not anticipate issuing updated versions of this advisory unless there is some material change in the facts. Should there be a significant change in the facts, Cisco will update this advisory.

A stand-alone copy or paraphrase of the text of this security advisory that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution
============
This notice will be posted on Cisco's worldwide website at http://www.cisco.com/warp/public/707...NS-auth.shtml.
In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients:

Cisco Security Procedures
=========================
Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/warp/public/707/
sec_incident_response.shtml. This includes instructions for press inquiries regarding Cisco security notices. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.

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This notice is Copyright 2003 by Cisco Systems, Inc. This notice may be redistributed freely after the release date given at the top of the text, provided that redistributed copies are complete and unmodified, and include all date and version information.
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